The Influence Preparation Way on Properties Powders AgI- SiO2

Hybrid powders (HP) based on mesoporous silica (MCM-48) doped with silver iodide have been prepared by hydrothermal-template synthesis. The effect of the concentration and sequence of the introduction of precursors of silver iodide and silica into the reaction mixture was studied on the textural, structural and morphological properties of the AgI-SiO2 systems. According to small angle XRD, most AgI-SiO2 samples are characterized by a hierarchically organized pore structure typical for MCM-48 silica matrix. The component ratio for the synthesis [Ag]/[Si] = 0.08 was determined by XRD. In the HPs prepared at this ratio silver iodide is arranged into the target crystal lattice of Iodargyrite, or β-AgI. The dependence of the silica matrix structure on the silver iodide/silica-precursor ratio has been discovered using IR spectroscopy. The morphological features of hybrid powders have been studied by scanning electron microscopy. Both the distribution mode of silver iodide over the silica matrix surface and the textural properties of the synthesized AgI-SiO2 powder have been found to be affected by the sequence of precursor introduction.